User guide

User Guide 185
PLIP (Parallel Line Internet Protocol)
A protocol for exchanging IP packets over a parallel cable.
Plug and Play
A standard in the personal computer market that assures the user that the
product is as simple to install as possible.
Policy Manager
One component in the WatchGuard Firebox System that provides a user
interface for modifying and uploading a Firebox configuration file.
pop-up window
A window that suddenly appears (pops up) when an option is selected with a
mouse or a function key is pressed.
port
A channel for transferring electronic information between a computer and a
network, peripherals, or another computer.
port address translation
See dynamic NAT.
portal
A Web site that serves as a gateway to the World Wide Web and typically offers
a search engine or links to other pages.
port forwarding
In the WatchGuard Firebox System, an option in which the Firebox redirects IP
packets to a specific masqueraded host behind the firewall based on the original
destination port number. Also called static NAT.
port space probe
An intrusion measure in which a hacker sequentially attacks port numbers. These
probes are usually attempts to map port space to look for security holes which
the sender might exploit.
port, TCP or UDP
A TCP or UDP service endpoint. Together with the hosts’ IP addresses, ports
uniquely identify the two peers of a TCP connection.
PPP (Point-to-Point Protocol)
A link-layer protocol used to exchange IP packets across a point-to-point
connection, usually a serial line.
PPPoE (Point-to-Point Protocol over Ethernet)
A specification for connecting the users on an Ethernet to the Internet through
a common broadband medium.
PPTP (Point-to-Point Tunneling Protocol)
A VPN tunnelling protocol with encryption. It uses one TCP port (for
negotiation and authentication of a VPN connection) and one IP protocol (for
data transfer) to connect the two peers in a VPN.